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Note 6 - Property and Equipment (Details Textual) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2018	Aug. 31, 2018	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finance Lease, Right-of-Use Asset, Accumulated Amortization	$ 900		$ 900		$ 900	$ 900
Property, Plant and Equipment, Net, Ending Balance	103,447		103,447		99,631	103,447
Proceeds from Sale of Property, Plant, and Equipment, Total					39	141	$ 146
Monterrey, Mexico Facility [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total	2,700
Gain (Loss) on Disposition of Property Plant Equipment, Total	200		200
Property in Houston, Texas [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total		$ 5,800
Gain (Loss) on Disposition of Property Plant Equipment, Total		$ 2,800		$ 2,800
MEXICO
Property, Plant and Equipment, Net, Ending Balance	$ 21,600		$ 21,600		$ 19,800	$ 21,600

X

- Definition

Amount of accumulated amortization attributable to right-of-use asset from finance lease.

+ References

No definition available.

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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